Vector fitting method for liquid rocket’s POGO vibration analysis
LIU Tao1,2,LIU Jinfan2,TANG Guo’an1
1. Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433,China
2. Aerospace System Engineering Shanghai, Shanghai 201109,China;
Abstract：Aiming at shortcomings of existing analysis methods for liquid rocket’s POGO vibration,the transfer function for a rocket propulsion-structure system was established, and the vector fitting method was applied to fitthe transfer function with rational fraction. Then the transfer function’s stable poles were determined with the steady state diagram, and the pole distribution was used to judge POGO stability. Furthermore, the suppression effect of different design states of accumulator on POGO vibration was analyzed and compared with that of the critical damping method. Results showed the vector fitting method has a higher accuracy than the critical damping method does;when the accumulator’s PV value is within the range of 0.157-0.196 MPaL, itssuppression effect on POGO vibration is the best; the proposed vector fitting method can provide a reference for suppressing other liquid rockets’ POGO vibration.
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